Unprecedented Pentacoordination of Di-2-pyridyI ketone N(4)-ethyl thiosemicarbazone Ligand with Formation of Trinuclear Cu(II) Complex

摘要

The syntheses and characterization of six copper(II) complexes of di-2-pyridyl ketone iV(4)-ethylthiosemicarbazone (HDpyETsc) are reported by means of partial elemental analyses, molar conductance measurements, electronic, infrared and EPR spectral studies. The complexes are represented as [Cu3(DpyETsc)2(NO3)4(H2O)2]·H2O (1), [Cu(DpyETsc)N3]·H2O (2), [Cu(DpyETsc)Cl]2·H2O (3), [Cu3(DpyETsc)2SO4]2·4H2O (4), [Cu(DpyETsc](ClO4)2·H2O (5) and [Cu(DpyETsc)(NCS)]2 (6). The compound 1 was found to be a trinuclear copper(II) complex with the ligand showing pentacoordination which is unprecedented for this type of ligand. Two centro-symmetric six membered metallocycles are formed and the terminal copper atoms have distorted square pyramidal geometry.